异质结
光催化
空位缺陷
X射线光电子能谱
光致发光
漫反射红外傅里叶变换
光谱学
材料科学
光电流
电子顺磁共振
光电子学
半导体
漫反射
分析化学(期刊)
光化学
化学
催化作用
光学
核磁共振
结晶学
物理
生物化学
色谱法
量子力学
作者
Xiuzhen Zheng,Huijuan Han,Jiafang Liu,Yang Yang,Lili Pan,Sujuan Zhang,Sugang Meng,Shifu Chen
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2022-04-14
卷期号:5 (4): 4475-4485
被引量:18
标识
DOI:10.1021/acsaem.1c04077
摘要
Defect engineering is considered as an efficient method for improving the photocatalytic activity of semiconductor photocatalysis because defects can not only serve as trapping centers for electrons and holes but also work as active sites for reaction. Herein, we synthesized a series of MoS2/CdS heterojunctions with abundant sulfur vacancies and used for photocatalytic N2 reduction. The sulfur vacancies at MoS2/CdS heterojunctions were confirmed by UV–vis diffuse-reflectance spectroscopy (UV-DRS) and electron paramagnetic resonance. The charge transfer behaviors of the photocatalysts were characterized by X-ray photoelectron spectroscopy, transient photocurrent, steady and transient photoluminescence spectroscopy, and so forth. Under visible light irradiation for 4 h, the production of NH3 at 3% MoS2/CdS heterojunctions (249.7 mg L–1 g–1) was about 5.4 and 3.9 times higher than that of pure MoS2 (45.9 mg L–1 g–1) and pristine CdS (64.5 mg L–1 g–1), respectively. The reaction mechanisms and pathways were further studied by in situ diffuse reflection infrared Fourier transform spectroscopy.
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